Telephone-transmitter.



F. GOTTSGHALK.

TELEPHONE TRANSMITTER. APPLICATION FILED AUG. 11, 1910.

Patented Aug. 15;"i9'11 2 SHEETS-SHEET 1.

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' ATTORNEY.

COLUMBIA PLANOGRAPH CO-IWASHINGTON, v.1;

F. GOTTSGHALK. TELEPHONE TRANSMITTER.

APPLICATION FILED AUG. 11, 1910. 1,000,795. Patented Aug. 15, 1911.

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INVENTOR, IZzlr 625M rromvzr.

COLUMBIA PLANDURAPH C0.. WASHINGTON. D. c.

FELIX GOTTSCHALK, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

Specification of Letters Patent.

Patented A11 15, 1911.

Application filed August 11, 1910. Serial No. 576,744.

To all whom it may concern:

Be it known that I, FELIX GOTTSCHALK, a citizen of the United States ofAmerica, and resident of the city of New York, in the county of New Yorkand State of New York, have invented certain new and useful Improvementsin Telephone-Transmitters, of which the following is a full, clear, andexact description.

This invention relating to improvements in telephone transmitters isapplicable on instruments of the Bell and several other types.

An object of the invention is to provide constructions and combinationsor arrangements of parts whereby the transmitter is proof against theentrance thereinto of air, moisture, dust or dirt, both at the front atwhich the diaphragm is located and at the rear through which thetelephone wire, connected with one of the electrodes of the resistancecup, leads.

Another obj eot is to improve the construction whereby the vibratoryimpulses of the diaphragm produced by talking thereagainst will betransmitted to the resistance cu in an extremely satisfactory manner andfor the improvement of the reproduction of the speech.

Another object is to provide construc-.

tions and arrangements whereby the terminal of the electric wire for thetransmitter may be placed in electrical connection with the metallicblock inside of the casing,which block is electrically connected withone of the electrodes,without opening or taking apart the sectionallymade shellor transmitter casing. And other objects are to generallyimprove, simplify and increase the operative efficiency, durability andprolonged life for the use of the trans mitter.

The invention is described in conjunction with the accompanying drawingsand is set forth in the several appended claims.

In the drawings, Figure 1 is a central vertical sectional view fromfront to rear, on a somewhat enlar ed scale, of a stand transmitter ofthe Be ll type in which the present improvements are embodied. Fig. 2 isa front view showing the aspect of the transmitter having the guard atthe front thereof. Fig. 3 is a partial sectional view showing a slightmodification in the formation of the guard for a slightly differentmanner of engagement on the casing, from that represented in Fig. 1.Fig. 4: is a perspective view showing rearwardly located parts andequipment of the instrument which are hereinafter particularlydescribed. Fig. 5 is a side elevation, with the transmitter portion insection, of a telephone set which unlike the stand set is held by thehand while listening and talking and on which the applicability of thepresent improvements is indicated. Fig. 6 is a plan view of theguardprovided transmitter shown in Fig. 5. Fig. 7 is a perspective -viewshowing the improved construction of combined diaphragm and frontelectrode.

Similar characters of reference indicate corresponding parts in all ofthe views.

In the drawings, A represents the casing of the transmitter comprisingrear section a of bell or cup shape and the front ann-ular section Z)closely fitted into the rear section and confined by the headed screws0. The opening at the front of the casing is, when a drum head diaphragmis employed as here represented, completely closed by such diaphragm,and as shown the very thin metallic diaphragm is made with a marginalrearwardly and then outwardly turned portion d and has its engagementnext inside of such angularly turned marginal portions disposed in frontof and close to the forward edge of the annular ring a which isforwardly extended from, and as an integral'part of, the casing sectionb. The diaphragm B has a plurality of separated thin metallic studs orpins f f in a distributed arrangement around its center which rearwardlyextend from a rigid connection with the diaphragm to rigid connectionwith the front electrode 9 of the carbon containing resistance cup C.The studs or pins while formed unitary with the diaphragm do notpenetrate or require the perforation of the latter, and they do notrequire in conjunction therewith any nuts or parts which facewise engageand have a dampening elfect upon the diaphragm; and in practice they aresecured to of the diaphragm by soldering, brazing or welding. Theprovision of the several dia phragm and electrode connecting studshaving a distributed arrangement near the center of the diaphragm and atthe zone or area of maximum'vlbration, conduces to inthe rear sidecreased intensity in the transmission of the articulatory impulsesthrough the resistance? cup.

D represents a metallic block, supported by insulation on the rear ofthe bridge E Within the casing, provided with a rearwardly openingsocket h, the walls of which are split and constrictive, as indicated 1nFig. 4. This block is byits plate like extension '5 and wire inelectrical connection with one of the electrodes in the resistance cup.

The transmitter casing is made with a portion or bushing piece Fappearing as a tubular boss rearwardly protruding beyond the surface ofthe'casing and externally screw threaded. The hole, lined withinsulating material, through this tubular portion of the casing is inaxial alinement with the socket h in the metallic piece D.

m represents the terminal tip of the elec tric wire of the transmitterwhich has the usual connection with the resistance cup, but it is hereshown as made with a shoulder m produced by a diametrically enlargedrear portion of the wire terminal or tip.

G represents a cup shaped member having an opening centrallytherethrough while its cylindrical portion is internally threaded for ascrew engagement with the passaged boss like rear portion of the casing.

0 represents a ring or layer of compressible material interposed betweenthe end of the boss F and the plane annular flange or back of the cupshaped coupling member G; and in an encircling relation to the telephonewire m where the latter adjoins the terminal tip.

It is always possibleby simply unscrewing the coupling member G to drawthe terminal tip out from its engagement with the metallic block D,without taking apart the sections of the transmitter casing and to asreadily place the terminal tip in its friction tight connection or slipfit engagement in the constrictive walled socket of said: block, asoccasion for replacement or repair may require; and the screwing home ofthe coupling member not only looks the connection and prevents theterminal tip from becoming pulled out, but by its compression of thepacking material 0 insures an absolutely tight closure of the passagethrough which the wire terminal entersthe casing and precludes theentrance of air, moisture or dust. And the screw engaging member G, whenapplied and tightened on the part F, through its engagement with theshouldered terminal tip forces the latter deeply into the constrictivewalled socket of the block D securing perfection of contact.

Thetransmitter casing made mouthpieceless and equipped; with aforaminous guard J in the front of and separated from, the

diaphragm, utilizes, as represented in Fig. 1,

the screws '0 c, which connect the separable sections of the casingtogether, for also affording rneans for the supporting'engagement of theguard on. the casing.

The guard proper is provided with a plurality of rearwardly extendingsupporting arms 2. If suitably bent or curved where necessary toaccommodate themselves to the beaded peripheral portion of thetransmitter casing; and the rearward extremities of the arms arearranged substantially in parallelism to each other and to the axis ofthe casing and have recesses a which open to their edges and by whichthe supporting arms when brought to embracing relations about thetransmitter casing and rotatively moved acquire engagements with thenecks of the casing screws and are by the heads of thelatter, when thescrews are fully screwed in, confined or locked to the casing. It isonly necessary to put on or take oif the guard that the screws beslightly turned outwardly so that the space between the bases of thescrew heads and the face of the casing is a little greater than thethickness of the edgewise recessed arms.

In Figs. 3, 5, and 6, the guard is indicated as having the supportingarms 25 thereof made with angularly and outwardly turned extremities ina common plane to be set against the flat front face portion of thecasing at which the studs or screws 0 are provided. The form andrelative arrangement of the edgewise opening recesses a in the severalsupporting arms of the guard are best represented in Fig. 6.

In Fig. 1 12 represents a ring of elastic rubber, or it may be acompressible ring of other material, interposed between the rear surfaceof the diaphragm adjacent its angularly turned margin and the forwardedge of the casing ribs e which ring when the diaphragm is tensioned bythe screw engaging annular confining member L increases the certainty oftheabs'olutely tight closure of the front of the casing, and suchcompressible ring forming a bearing support for the margin of thediaphragm on the casing amplifies the capability of vibration of thediaphragm. This ring 11 of rubber may, as represented in Fig. 1, be wideenough to overlap a considerable portion of the diaphragm near itsmargin and to act as a damper for the diaphragm. If deemed necessary ordesirable a packing ring to may be interposed where the sections a andZ; of the casing are adjoined.

I claim l. A telephone transmitter having interiorly therein a metallicblock provided with a rearwardly opening socket and connected with oneof the electrodes, the transmitter casing having an apertured portionrearwardly in line with said socket, and the terminal tip of thetelephone wire adapted for insertion through the said apertured rearportion of the casing for a slip fit engagement in said socket, and adevice for making a tight closure between the terminal tip and theapertured portion of the casing through which it is inserted, and meanswhich engages the terminal tip and forces it to and holds it in itsplace in said socket.

2. A telephone transmitter having interiorly therein a metallicconnection piece for the terminal of the telephone wire, the casing ofthe transmitter having at its rear portion a tubular rearwardlyextending screw threaded boss, theterminal tip of the telephone wireprovided with a shoulder and adapted to be entered through said boss andengaged with said connection piece, a cup shaped and centrally aperturedmember surrounding the terminal tip and engaging the shoulder thereofand also screw engaging said threaded boss and a packing within said cupshaped member and between same and the boss, to be compressed about theentering portion of the terminal tip under the coaction of the saidscrew engaging parts.

transmitter made with an 3. A telephone its front and having aforopening through wardly protruding annular rib surrounding saidopening, having a portion of its external wall screw threaded, adiaphragm having a rearwardly and outwardly turned marginal portioncovering the opening of the casing, a ring of compressible materialinterposed at the rear side of the diaphragm between the portion thereofadjacent its rearwardly turned part and the forward edge of said rib andretained against displacement by said rearwardly turned por tion, and aconfining ring having screw engagement with the threaded portion of thecasing and also having an engagement with the marginal outturned portionof the diaphragm.

Signed by me at New York city, N. Y., in presence of two subscribingwitnesses.

FELIX GOTTSGHALK.

Witnesses:

G. H. BUSH, A. E. MORRIS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. C.

